What to do about "Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted."

Question

I'm writing an iPhone app using Appcelerator Titanium Mobile. I am hiding and showing the tab group based on what window has focus.

dashWin.addEventListener("focus",function(e) {
    if (dashWin.tabGroupVisible == true) {
        dashWin.tabGroupVisible=false;
        tabGroup.animate({bottom:-50,duration:500});
    }
});

The code above hides the tab group when dashWin receives a focus event. However, I see this message in the Titanium console when the event fires while running in the iPhone simulator:

Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

A Google search turns up one result: Another StackOverflow question that may have a hint as to what's going on.

Answer 1

I got this error when I linked Action Segue or Selection Segue from one view to another view through storyboard and performed the same segue programmatically again, which makes the navigation controller perform the same segue twice.

2 solutions for this case:

1. Removing the code that pushes the view. Just let storyboard perform the segue for you. This is good for most situations.
2. Replacing Action Segue or Selection Segue with Manual Section and do - (void)performSegueWithIdentifier:(NSString *)identifier sender:(id)sender by yourself. You may find this solution useful when you want to customize the behavior of segue according to the sender.

Answer 2

Usually a tab group acts as the root of your app's navigation. When a user taps a tab, that tab's window is focused.

Next, when a user triggers an action that requires a new window appear, it usually appears either modally or on top (in the navigation stack sense) of the current window. In the latter case, tell the current tab to open the new window.

If you set the tabBarHidden property to false (when you create the new window), the tab bar will be hidden for you when the new window is opened by the current tab.

Will this more standard approach work for you?